12771819 has 18 divisors (see below), whose sum is σ = 19475196. Its totient is φ = 8064360.

The previous prime is 12771809. The next prime is 12771821. The reversal of 12771819 is 91817721.

It is not a de Polignac number, because 12771819 - 2⁹ = 12771307 is a prime.

It is a super-2 number, since 2×12771819² = 326238721137522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12771809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1284 + ... + 5214.

Almost surely, 2^12771819 is an apocalyptic number.

12771819 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

12771819 is a deficient number, since it is larger than the sum of its proper divisors (6703377).

12771819 is a wasteful number, since it uses less digits than its factorization.

12771819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3975 (or 3953 counting only the distinct ones).

The product of its digits is 7056, while the sum is 36.

The square root of 12771819 is about 3573.7681793871. The cubic root of 12771819 is about 233.7496226175.

The spelling of 12771819 in words is "twelve million, seven hundred seventy-one thousand, eight hundred nineteen".